1. I did design a bridge some twenty years ago, and constructed a

span near Greenfield, in Massachusetts, which gave way, owing to a defective casting, while being tested. The bridge was not finished; had not been opened to the public; had not been accepted from the contractor, who repaired the damage in such a manner that a recurrence of a break would have been impossible. I have built spans of bridges and tested them until they broke, to ascertain their ultimate strength, but I supposed that this was a matter that concerned myself and not the public. If the bridge had been thrown open for public use, and an accident had then occurred from defective design or material, the engineer might have been censurable, but not otherwise. In an experience of nearly forty years I have never had a bridge to fail, after being opened for travel, or a piece of masonry to give way. No accident occurred even upon the temporary military bridges constructed during the war, which President Lincoln used to say were built of bean poles and corn stalks.